An RTE insider says that "viewers will be taken aback" by what George has to say on tonight's show.

It's not clear exactly as to the reason why George is appearing on the show, but has been embroiled in controversy recently.

Hook hit the headlines when he suggested that Ireland out-half Johnny Sexton should consider retirement following a series of head injuries in recent seasons.

Sexton was stood down for 12 weeks in late 2014 having sustained four head injuries in the calendar year and prior to the start of this year's Six Nations campaign, he stated that the playmaker should consider retirement following a head collision in action for Leinster against Toulon in the Champions Cup.

"The latest brain injury could be career-defining for Ireland's No 10 and will not easily be overlooked by him passing 'the protocols'," he wrote in his Irish independent column.

Broadcaster George Hook

"What price is the 30-year-old prepared to put on his future health? How many more blows to the head is he prepared to take in the name of professional sport?

"Maybe it's time he gave serious consideration to cashing in his insurance policy and leaving rugby with his faculties still intact."

After Sexton was replaced in the Six Nations opener against Wales, he once again called into question the 30-year-old's welfare.

"I will be so angry if Sexton plays (against England). He should go away and rest. Johnny Sexton should talk to his wife and parents," he told Independent.ie's live Six Nations panel discussion.